The cardboard was yellowed, but the foil was intact. CR1616. 3 Volts. Energizer.

He spent months scouring the rusted husks of the Old World. He didn't look in jewelry stores or tech hubs—those had been picked clean decades ago. Instead, he tracked a map to the ruins of a suburban "Big Box" graveyard. He found the collapsed blue-and-yellow sign of a , half-buried in the silt of the Minnesota plains.

With trembling hands, Elias returned to his workshop. He unscrewed the back of the watch, popped the ancient, leaking cell out, and clicked the new one in. He held his breath.